In the first event, the code will change the instigator parameter to objNull, which in the second event will return objNull, instead of "B Alpha 1-2: 1 (Dell)"
```sqf
_unit = cursorObject;
_unit addEventHandler ["Killed", {
// "Killed #0 (425.779): [B Alpha 1-1:1,B Alpha 1-2:1 (Dell),B Alpha 1-2:1 (Dell),true]"
diag_log format["Killed #%1 (%2): %3", _thisEventHandler, diag_tickTime, _this];
_this set [2, objNull];
}];
_unit addEventHandler ["Killed", {
// "Killed #1 (425.779): [B Alpha 1-1:1,B Alpha 1-2:1 (Dell),<NULL-object>,true]"
diag_log format["Killed #%1 (%2): %3", _thisEventHandler, diag_tickTime, _this];
}];
```